[ci] Fix --dry not being passed correctly

[poteto]

Boolean params for dry runs are true if the param exists at all, so only add it if we're in dry run mode.

[react-sizebot]

Comparing: 4c9392b...b876368

Critical size changes

Includes critical production bundles, as well as any change greater than 2%:

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
oss-stable/react-dom/cjs/react-dom.production.js	=	6.68 kB	6.68 kB	=	1.83 kB	1.83 kB
oss-stable/react-dom/cjs/react-dom-client.production.js	=	515.73 kB	515.73 kB	=	92.10 kB	92.10 kB
oss-experimental/react-dom/cjs/react-dom.production.js	=	6.69 kB	6.69 kB	=	1.83 kB	1.83 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js	=	565.65 kB	565.65 kB	=	100.87 kB	100.87 kB
facebook-www/ReactDOM-prod.classic.js	=	636.71 kB	636.71 kB	=	112.07 kB	112.07 kB
facebook-www/ReactDOM-prod.modern.js	=	627.03 kB	627.03 kB	=	110.49 kB	110.49 kB

Significant size changes

Includes any change greater than 0.2%:

(No significant changes)

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